You can have more to it than the complexity penalty, but you need a complexity penalty. The number of possibilities increases exponentially with the complexity. If the probability didn't go down faster, the total probability would be infinite. But that's impossible. It has to add to one.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.